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PATENT OF INVENTION IFP Energies nouvelles 5 PROCESS FOR THE PREPARATION OF A CATALYST INTENDED FOR USE IN A FISCHER-TROPSCH REACTION Inventors: Fabrice DIEHL and Jean-Christophe VIGUIE 10 Abstract The process makes it possible to prepare a catalyst, intended for use in a Fischer-Tropsch reaction. In a reactor I a catalyst support impregnated with a solution of cobalt nitrate is oxidized at 15 a calcining temperature comprised between 400°C and 450°C in order to produce a catalyst precursor comprising cobalt oxides. Then, the catalyst precursor is brought into contact in the reduction reactor A with the reducing gas rich in hydrogen and with a low water content , by circulating the flow of reducing gas, so as to reduce the cobalt oxides to Co and to produce water. Then, the water content is reduced to 200 ppmvol of the flow of 20 reducing gas laden with water recovered at the outlet of the reactor A, and at least a part of the flow of reducing gas is recycled to the reactor A. In the process, the reducing gas is maintained at a water content less than 10,000 ppmvol in the reactor A. Figure 1 L--L~w |